How canoers will use ancient navigation in ocean

By SAM EIFLING Associated Press
| 6:11 a.m.May 22, 2014

Navigator Chad Kalepa Baybayan stands aboard the deck of the Hokulea canoe Tuesday, April 29, 2014 off Honolulu. The Polynesian voyaging canoe is setting off on a 3-year voyage around the world using no modern instrumentation. (AP Photo/Oskar Garcia)
The Associated Press

Navigator Chad Kalepa Baybayan stands aboard the deck of the Hokulea canoe Tuesday, April 29, 2014 off Honolulu. The Polynesian voyaging canoe is setting off on a 3-year voyage around the world using no modern instrumentation. (AP Photo/Oskar Garcia)

The Hokulea sailing canoe is seen off Honolulu on Tuesday, April 29, 2014. The Polynesian voyaging canoe is setting off on a 3-year voyage around the world, navigating using no modern instrumentation. (AP Photo/Sam Eifling)The Associated Press

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The Hokulea sailing canoe is seen off Honolulu on Tuesday, April 29, 2014. The Polynesian voyaging canoe is setting off on a 3-year voyage around the world, navigating using no modern instrumentation. (AP Photo/Sam Eifling)

HONOLULU (AP) — When a Polynesian voyaging canoe called the Hokulea embarked on its first trips in Hawaii in the mid-1970s, its crew was trying to prove in part that travel without modern instruments or techniques was possible.

That early crew set out for Tahiti, an island 28 miles wide from more than 2,700 miles away, on a trip that's roughly like leaving Maine and hitting a bull's-eye the size of San Diego, without any roads or landmarks to show the way.

In an era of global positioning satellites, this can seem a relatively mundane feat.

Now, the Hokulea is set to embark on a more challenging voyage: a three-year, 47,000-mile odyssey that will take it to 85 ports in 26 countries. Among its goals is to impart the ancient style of navigation to a new generation of ocean farers.

"One degree off 2,000 miles away will take you to Antarctica," said Lehua Kamalu, 27, an apprentice navigator who was charmed by the Hokulea when she was a mechanical engineering student at the University of Hawaii.

The complexity also highlights the vastness of the Pacific Ocean, which occupies 46 percent of the world's surface (the contiguous 48 U.S. states would fit inside it 20 times) and the difficulty of hitting a tiny speck in it.

Pulling an island out of the sea, as navigators say, requires, among other things, a navigator to be alert 20 hours a day, with 20-minute sips of sleep as her only respite.

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HOLDING DIRECTION

The rotation of the earth guides the sun and stars across the sky in a predictable east-to-west fashion. The prevailing wind and waves also scoot in from the east.

Navigators, therefore, can tell direction and latitude from star positions and the feel of the waves.

Longitude is trickier. To tell how far north and south they are, navigators must rely on dead reckoning — figuring speed, and multiplying that by days and hours on the open water.

On the Hokulea, apprentice navigators track bubbles on the water's surface. Watch a bubble at the front of the boat, count the seconds before the boat passes it, and divide that number into 25 to get the boat's speed in knots.

The best navigators run these figures constantly, balancing their decisions against their own calculations and the best estimations of their crew. "You've got to stick it all in your head and hope it stays there," Kamalu said.

Maintaining heading is vital, and can be tricky through storms, under clouds and during the midday hours, when the sun sits centrally in the sky and points to nowhere. The heavens are helpful only about one-fifth of the time.

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ARRIVING AT LAND

Floating plants or other debris on the surface will whisper when land is near. But it is only an approximation, without direction.

Sea birds will point the way there. In the Pacific, the Grey Noddy tern, which fishes during the day and heads home to its nest at night, will lead a crew toward land.

"You make a thousand observations of nature a day and you make two decisions a day," said Jenna Ishii, 29, an apprentice navigator. "Even the masters, they don't ever call themselves 'master navigators.' They continually call themselves students."

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Sam Eifling can be reached on Twitter at http://twitter.com/sameifling